Woodward 20-Series Pumps

Support and Parts Availability

The Woodward 20-Series Pumps were designed to supply oil from 175 to 200 PSI, typically to Gateshaft style governor systems. The system included a gear pump, unloader, check and relief valves, and an air-over-oil pressure tank.A unique feature was its ability to recharge its own air head. With proper maintenance and care even the oldest models can continue to provide reliable service well into the future.These pumps were supplied in multiple sizes:Size 21Size 23 1/2 to 24 1/2Size 25 to 26 1/2Size 27 to 27 1/2

The size of the pump is important for proper support. The pump size and serial number are marked on the
side of each pump tank.

Typical 20-Series Pump

Support Services Offered by American Governor Company:

• Parts and Gaskets Required for Routine Maintenance

• Maintenance Recommendations

• Pump Air/Oil Balancing Procedures

• Replacement Exchange Program – Pumping Elements

• Drive System Replacement – Chain to V-Belt Drive Upgrades

• On Site Service and Support

Cutaway View of a 20-Series Pump

Pumping Element Replacement-Exchange Program:After many years of service, the 20-Series pump may begin to lose its ability to pump effectively. This becomes apparent when the pump is required to pump air into the accumulator during the pump balancing procedure.The loss of pumping ability does not mean that the system must be replaced. The degradation in pumping ability is usually the result of excessive end clearance and tolerance issues within the pumping element chamber.

The replacement/exchange process consists of four steps:

1) AGC Supplies a Reconditioned Pumping Element Assembly

2) Customer Removes Old Pumping Element Assembly

3) Customer Installs New Pumping Element Assembly

4) Old Pumping Element Assembly is Returned to AGC

Chain Drive Replacement System:

The original chain drive systems provided with some 20-Series Pump systems have proven to be problematic. A replacement system has been designed to change the chain system to a V-Belt system. A kit can be provided based on the following information: pump size, pump serial number, motor shaft size, motor frame size.

Size 26 V Belt Kit

Riveted Tanks: Some customers have expressed concerns over the riveted tanks used on early 20-Series Pumps. While the exact factors of safety and modern day code compliance may be in question, it should be noted that the tanks are not just riveted together, they are also brazed as shown in the two photos below.

Brazed Tank – Inside

Brazed Tank – Outside

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This information can come in handy as customers evaluate the status of their existing pumping systems.

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Woodward 20-Series Rotary Gear Pump Parts and Reference Numbers: Reference Numbers are taken from Woodward manual 15001H (Rotary Gear Pumps Woodward Hydraulic Governors Manual 15001H)Note: Because of different pump sizes, there can be multiple part numbers for each reference number.